points - 20 , brainliest , and thank you , 5 star
The area labeled in green represents what region of North America and the present-day United States?
A)	the Great Plains	
B)	the Rocky Mountains	
C)	the Appalachian Mountains	
D)	the Mississippi River Valley
                                             
                                          
                                          
                                        
											 
			                   
					                  